after some research ,trial and error i finally got THE BEST video converter + joiner -
XILISOFT VIDEO CONVERTER ULTIMATE
It can convert any format to any format individually,in batches,join any type of files to one video format(wmv,mov,avi,mp4,rmvb,mpeg,divx,asf).
It converts and joins files without interruption.
It can split files,give effect to video files.
For e.g if u have 2 avi files, 3mpeg files, 6mov files, 8 wmv files and u want to convert them to 1 rmvb file then just select those files give MERGE option and select RMVB & go......check after few hours & the output is ready.
It is so systematic that once you select the files and give the type to convert it to,it gives you the TIME it'll take to give u the final output and even the SIZE & DURATION of the output file..and this is all accurate!!!!
Mainly,its very easy to use as for those who dont know the technicalities of wat audio rate to keep,frame rate to keep etc,they can keep everything on AUTO & NORMAL,& the converter takes its course gives u a optimized output,which is very good.
I converted a 1.3gb bunch of avi,mov files into one 345mb rmvb file..it was goooood!!
The sound quality is good and it does not lag behind or after the picture frames.
I rate it,through my experience 9/10.
If u have any doubt on this,PM me.